Preovulatory sonographic uterine receptivity index (SURI): usefulness as an indicator of pregnancy in women undergoing assisted reproductive treatments.

To evaluate the uterine component as a determinant variable in the probability of establishing a pregnancy after assisted reproductive treatments, we introduced a mathematical formula derived from standard endovaginal uterine monitored color Doppler imaging parameters. We analyzed 102 cycles of ovarian stimulation with leuprolide acetate and exogenous gonadotropins resulting in 52 clinical pregnancies by stepwise logistic regression analysis. Sonographic endometrial pattern, thickness, diastolic blood flow, and resistive index variables were transformed into categorical variables and forced to yield a regression equation. Sonographic uterine receptivity index was calculated as a summation of four times endometrial pattern, five times resistive index, and two times diastolic blood flow. This index yielded values for each patient in a range of 0 to 15. Scores > or = 13 were associated with a successful outcome in 79.4% of the patients, whereas scores between 8 and 12 were accompanied by 45.8% pregnancy rates (P = 0.01), and scores < or = 7 had successful treatment outcome in only 7.7% (P = 0.0001). The scores obtained by this mathematical equation provide the ability to make reliable predictions about the outcome of assisted reproductive treatments in women undergoing ovulation induction with leuprolide acetate and human menopausal gonadotropins.